Hello there, while im writing this one, my betta are still spawning. I got the opportunity to witness the beauty of spawning with my own eyes hehe, i got some vid of them spawning, can you guys give me advice so that my soon to be fry can survive (all of them)

To have zero death rate in breeding.
Is near to impossible.
My advice to u is, just relax and take then slowly.
Dont have to do to much in the first two week.
Just feed them enough to get full(3-5) time a day.

That looks like a Lott of eggs because from the video, everytime he moved some eggs fell out. They are new breeders aren't they. Don't worry they will eventually get the hang of it. She looks like she will supply a great amount of eggs. You can also try artificial hatching for the eggs.

I would wait another day and then determine if they are gone. Also try again.